Photo-Isomerization Kinetics of Azobenzene Containing Surfactant Conjugated with Polyelectrolyte
Ionic complexation of azobenzene-containing surfactants with any type of oppositely charged soft objects allows for making them photo-responsive in terms of their size, shape and surface energy. Investigation of the photo-isomerization kinetic and isomer composition at a photo-stationary state of th...
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doaj-53b2786c2d8e4696aa33780d3fe6c8102020-12-23T00:05:20ZengMDPI AGMolecules1420-30492021-12-0126191910.3390/molecules26010019Photo-Isomerization Kinetics of Azobenzene Containing Surfactant Conjugated with PolyelectrolyteAnjali Sharma0Marek Bekir1Nino Lomadze2Svetlana Santer3Institute of Physics and Astronomy, University of Potsdam, 14476 Potsdam, GermanyInstitute of Physics and Astronomy, University of Potsdam, 14476 Potsdam, GermanyInstitute of Physics and Astronomy, University of Potsdam, 14476 Potsdam, GermanyInstitute of Physics and Astronomy, University of Potsdam, 14476 Potsdam, GermanyIonic complexation of azobenzene-containing surfactants with any type of oppositely charged soft objects allows for making them photo-responsive in terms of their size, shape and surface energy. Investigation of the photo-isomerization kinetic and isomer composition at a photo-stationary state of the photo-sensitive surfactant conjugated with charged objects is a necessary prerequisite for understanding the structural response of photo-sensitive complexes. Here, we report on photo-isomerization kinetics of a photo-sensitive surfactant in the presence of poly(acrylic acid, sodium salt). We show that the photo-isomerization of the azobenzene-containing cationic surfactant is slower in a polymer complex compared to being purely dissolved in aqueous solution. In a photo-stationary state, the ratio between the <i>trans</i> and <i>cis</i> isomers is shifted to a higher <i>trans</i>-isomer concentration for all irradiation wavelengths. This is explained by the formation of surfactant aggregates near the polyelectrolyte chains at concentrations much lower than the bulk critical micelle concentration and inhibition of the photo-isomerization kinetics due to steric hindrance within the densely packed aggregates.https://www.mdpi.com/1420-3049/26/1/19azobenzenephoto-sensitive surfactantphoto-isomerization kineticspoly(acrylic acid, sodium salt) |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Anjali Sharma Marek Bekir Nino Lomadze Svetlana Santer |
spellingShingle |
Anjali Sharma Marek Bekir Nino Lomadze Svetlana Santer Photo-Isomerization Kinetics of Azobenzene Containing Surfactant Conjugated with Polyelectrolyte Molecules azobenzene photo-sensitive surfactant photo-isomerization kinetics poly(acrylic acid, sodium salt) |
author_facet |
Anjali Sharma Marek Bekir Nino Lomadze Svetlana Santer |
author_sort |
Anjali Sharma |
title |
Photo-Isomerization Kinetics of Azobenzene Containing Surfactant Conjugated with Polyelectrolyte |
title_short |
Photo-Isomerization Kinetics of Azobenzene Containing Surfactant Conjugated with Polyelectrolyte |
title_full |
Photo-Isomerization Kinetics of Azobenzene Containing Surfactant Conjugated with Polyelectrolyte |
title_fullStr |
Photo-Isomerization Kinetics of Azobenzene Containing Surfactant Conjugated with Polyelectrolyte |
title_full_unstemmed |
Photo-Isomerization Kinetics of Azobenzene Containing Surfactant Conjugated with Polyelectrolyte |
title_sort |
photo-isomerization kinetics of azobenzene containing surfactant conjugated with polyelectrolyte |
publisher |
MDPI AG |
series |
Molecules |
issn |
1420-3049 |
publishDate |
2021-12-01 |
description |
Ionic complexation of azobenzene-containing surfactants with any type of oppositely charged soft objects allows for making them photo-responsive in terms of their size, shape and surface energy. Investigation of the photo-isomerization kinetic and isomer composition at a photo-stationary state of the photo-sensitive surfactant conjugated with charged objects is a necessary prerequisite for understanding the structural response of photo-sensitive complexes. Here, we report on photo-isomerization kinetics of a photo-sensitive surfactant in the presence of poly(acrylic acid, sodium salt). We show that the photo-isomerization of the azobenzene-containing cationic surfactant is slower in a polymer complex compared to being purely dissolved in aqueous solution. In a photo-stationary state, the ratio between the <i>trans</i> and <i>cis</i> isomers is shifted to a higher <i>trans</i>-isomer concentration for all irradiation wavelengths. This is explained by the formation of surfactant aggregates near the polyelectrolyte chains at concentrations much lower than the bulk critical micelle concentration and inhibition of the photo-isomerization kinetics due to steric hindrance within the densely packed aggregates. |
topic |
azobenzene photo-sensitive surfactant photo-isomerization kinetics poly(acrylic acid, sodium salt) |
url |
https://www.mdpi.com/1420-3049/26/1/19 |
work_keys_str_mv |
AT anjalisharma photoisomerizationkineticsofazobenzenecontainingsurfactantconjugatedwithpolyelectrolyte AT marekbekir photoisomerizationkineticsofazobenzenecontainingsurfactantconjugatedwithpolyelectrolyte AT ninolomadze photoisomerizationkineticsofazobenzenecontainingsurfactantconjugatedwithpolyelectrolyte AT svetlanasanter photoisomerizationkineticsofazobenzenecontainingsurfactantconjugatedwithpolyelectrolyte |
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1724373772657491968 |